EFFECTS OF SUPPLEMENTARY IRRADIANCE ON FLOWERING TIME OF OBLIGATE LONG DAY ORNAMENTAL ANNUALS UNDER NON-INDUCTIVE ENVIRONMENT

摘要

Using joint segregation analysis (JSA) technique as statistical approach, mixed inheritance analysis for cell plasmamembrane as membrane thermal stability (MTS) was assayed in two parental lines (P1, P2) and their four populations (F1, BC1,BC2, F2) of four wheat crosses, viz., Hashim-08 × LU-26, Farid-06 × Shafaq, Parula × Blue Silver and TD-1 × D-97603 atFaculty of Agriculture, Gomal University, Dera Ismail Khan, Pakistan during crop season 2011-12. Results revealed that MTSwas under control of two mixed groups of genes i.e., additive-dominant-epistatic major genes plus additive–dominant-epistasisof polygenes (model E) in Hashim-08 × LU-26 and Farid-06 × Shafaq crosses, respectively. In cross Parula × Blue Silver, itwas governed by mixed genes i.e. one major-gene and additive-dominance-epistatic polygenes (model D). However, in crossTD-1 × D-97603, the MTS was under the influence of mixed epistasis of two major genes plus polygenes (model E-1).Polygene variation and polygene heritability were higher than major gene variation and heritability in crosses Hashim-08 × LU26and Farid-06 × Shafaq. In crosses Parula × Blue Silver and TD-1 × D-97603, the major gene variation and heritability werehigher than polygene variation and heritability, indicating maximum contribution of the major genes. While in cross TD-1 × D97603,epistatic components were also positive and due to which the polygene heritability was almost zero. Moderate to highenvironmental variation in the MTS for segregating generations revealed that the said trait was highly persuaded by theenvironment. However, the genetic behavior of the MTS suggested that early selection for MTS in the crosses Hashim-08 ×LU-26 and Farid-06 × Shafaq would be efficient. Whereas, the delayed selection in crosses Parula × Blue Silver and TD-1 × D97603until the accumulation of maximum favorable genes will be effective.